4add8d9302
is non-free. (More checks can/should be added in the future.) Use M_ASSERTVALID in BPF_MTAP so that we catch when freed mbufs are passed in, even if no bpf listeners are active. Inspired by a bug in if_dc caught by Kenjiro Cho.
381 lines
12 KiB
C
381 lines
12 KiB
C
/*
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* Copyright (c) 1990, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from the Stanford/CMU enet packet filter,
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* (net/enet.c) distributed as part of 4.3BSD, and code contributed
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* to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
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* Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)bpf.h 8.1 (Berkeley) 6/10/93
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* @(#)bpf.h 1.34 (LBL) 6/16/96
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*
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* $FreeBSD$
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*/
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#ifndef _NET_BPF_H_
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#define _NET_BPF_H_
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/* BSD style release date */
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#define BPF_RELEASE 199606
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typedef int32_t bpf_int32;
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typedef u_int32_t bpf_u_int32;
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/*
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* Alignment macros. BPF_WORDALIGN rounds up to the next
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* even multiple of BPF_ALIGNMENT.
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*/
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#define BPF_ALIGNMENT sizeof(long)
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#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
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#define BPF_MAXINSNS 512
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#define BPF_MAXBUFSIZE 0x80000
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#define BPF_MINBUFSIZE 32
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/*
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* Structure for BIOCSETF.
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*/
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struct bpf_program {
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u_int bf_len;
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struct bpf_insn *bf_insns;
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};
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/*
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* Struct returned by BIOCGSTATS.
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*/
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struct bpf_stat {
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u_int bs_recv; /* number of packets received */
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u_int bs_drop; /* number of packets dropped */
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};
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/*
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* Struct return by BIOCVERSION. This represents the version number of
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* the filter language described by the instruction encodings below.
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* bpf understands a program iff kernel_major == filter_major &&
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* kernel_minor >= filter_minor, that is, if the value returned by the
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* running kernel has the same major number and a minor number equal
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* equal to or less than the filter being downloaded. Otherwise, the
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* results are undefined, meaning an error may be returned or packets
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* may be accepted haphazardly.
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* It has nothing to do with the source code version.
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*/
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struct bpf_version {
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u_short bv_major;
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u_short bv_minor;
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};
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/* Current version number of filter architecture. */
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#define BPF_MAJOR_VERSION 1
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#define BPF_MINOR_VERSION 1
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#define BIOCGBLEN _IOR('B',102, u_int)
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#define BIOCSBLEN _IOWR('B',102, u_int)
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#define BIOCSETF _IOW('B',103, struct bpf_program)
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#define BIOCFLUSH _IO('B',104)
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#define BIOCPROMISC _IO('B',105)
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#define BIOCGDLT _IOR('B',106, u_int)
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#define BIOCGETIF _IOR('B',107, struct ifreq)
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#define BIOCSETIF _IOW('B',108, struct ifreq)
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#define BIOCSRTIMEOUT _IOW('B',109, struct timeval)
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#define BIOCGRTIMEOUT _IOR('B',110, struct timeval)
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#define BIOCGSTATS _IOR('B',111, struct bpf_stat)
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#define BIOCIMMEDIATE _IOW('B',112, u_int)
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#define BIOCVERSION _IOR('B',113, struct bpf_version)
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#define BIOCGRSIG _IOR('B',114, u_int)
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#define BIOCSRSIG _IOW('B',115, u_int)
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#define BIOCGHDRCMPLT _IOR('B',116, u_int)
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#define BIOCSHDRCMPLT _IOW('B',117, u_int)
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#define BIOCGSEESENT _IOR('B',118, u_int)
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#define BIOCSSEESENT _IOW('B',119, u_int)
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#define BIOCSDLT _IOW('B',120, u_int)
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#define BIOCGDLTLIST _IOWR('B',121, struct bpf_dltlist)
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/*
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* Structure prepended to each packet.
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*/
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struct bpf_hdr {
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struct timeval bh_tstamp; /* time stamp */
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bpf_u_int32 bh_caplen; /* length of captured portion */
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bpf_u_int32 bh_datalen; /* original length of packet */
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u_short bh_hdrlen; /* length of bpf header (this struct
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plus alignment padding) */
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};
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/*
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* Because the structure above is not a multiple of 4 bytes, some compilers
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* will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
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* Only the kernel needs to know about it; applications use bh_hdrlen.
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*/
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#ifdef _KERNEL
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#define SIZEOF_BPF_HDR (sizeof(struct bpf_hdr) <= 20 ? 18 : \
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sizeof(struct bpf_hdr))
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#endif
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/*
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* Data-link level type codes.
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*/
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#define DLT_NULL 0 /* no link-layer encapsulation */
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#define DLT_EN10MB 1 /* Ethernet (10Mb) */
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#define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */
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#define DLT_AX25 3 /* Amateur Radio AX.25 */
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#define DLT_PRONET 4 /* Proteon ProNET Token Ring */
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#define DLT_CHAOS 5 /* Chaos */
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#define DLT_IEEE802 6 /* IEEE 802 Networks */
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#define DLT_ARCNET 7 /* ARCNET */
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#define DLT_SLIP 8 /* Serial Line IP */
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#define DLT_PPP 9 /* Point-to-point Protocol */
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#define DLT_FDDI 10 /* FDDI */
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#define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */
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#define DLT_RAW 12 /* raw IP */
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/*
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* These are values from BSD/OS's "bpf.h".
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* These are not the same as the values from the traditional libpcap
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* "bpf.h"; however, these values shouldn't be generated by any
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* OS other than BSD/OS, so the correct values to use here are the
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* BSD/OS values.
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*
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* Platforms that have already assigned these values to other
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* DLT_ codes, however, should give these codes the values
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* from that platform, so that programs that use these codes will
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* continue to compile - even though they won't correctly read
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* files of these types.
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*/
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#define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */
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#define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */
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#define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */
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/*
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* These values are defined by NetBSD; other platforms should refrain from
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* using them for other purposes, so that NetBSD savefiles with link
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* types of 50 or 51 can be read as this type on all platforms.
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*/
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#define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */
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#define DLT_PPP_ETHER 51 /* PPP over Ethernet */
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/*
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* This value was defined by libpcap 0.5; platforms that have defined
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* it with a different value should define it here with that value -
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* a link type of 104 in a save file will be mapped to DLT_C_HDLC,
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* whatever value that happens to be, so programs will correctly
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* handle files with that link type regardless of the value of
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* DLT_C_HDLC.
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*
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* The name DLT_C_HDLC was used by BSD/OS; we use that name for source
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* compatibility with programs written for BSD/OS.
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*
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* libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well,
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* for source compatibility with programs written for libpcap 0.5.
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*/
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#define DLT_C_HDLC 104 /* Cisco HDLC */
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#define DLT_CHDLC DLT_C_HDLC
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#define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */
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/*
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* Values between 106 and 107 are used in capture file headers as
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* link-layer types corresponding to DLT_ types that might differ
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* between platforms; don't use those values for new DLT_ new types.
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*/
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/*
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* OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except
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* that the AF_ type in the link-layer header is in network byte order.
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*
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* OpenBSD defines it as 12, but that collides with DLT_RAW, so we
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* define it as 108 here. If OpenBSD picks up this file, it should
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* define DLT_LOOP as 12 in its version, as per the comment above -
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* and should not use 108 as a DLT_ value.
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*/
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#define DLT_LOOP 108
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/*
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* Values between 109 and 112 are used in capture file headers as
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* link-layer types corresponding to DLT_ types that might differ
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* between platforms; don't use those values for new DLT_ new types.
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*/
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/*
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* This is for Linux cooked sockets.
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*/
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#define DLT_LINUX_SLL 113
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/*
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* Apple LocalTalk hardware.
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*/
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#define DLT_LTALK 114
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/*
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* Acorn Econet.
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*/
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#define DLT_ECONET 115
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/*
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* Reserved for use with OpenBSD ipfilter.
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*/
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#define DLT_IPFILTER 116
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/*
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* Reserved for use in capture-file headers as a link-layer type
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* corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD,
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* but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it
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* in capture-file headers.
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*/
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#define DLT_PFLOG 117
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/*
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* Registered for Cisco-internal use.
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*/
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#define DLT_CISCO_IOS 118
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/*
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* Reserved for 802.11 cards using the Prism II chips, with a link-layer
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* header including Prism monitor mode information plus an 802.11
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* header.
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*/
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#define DLT_PRISM_HEADER 119
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/*
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* Reserved for Aironet 802.11 cards, with an Aironet link-layer header
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* (see Doug Ambrisko's FreeBSD patches).
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*/
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#define DLT_AIRONET_HEADER 120
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/*
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* The instruction encodings.
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*/
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/* instruction classes */
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#define BPF_CLASS(code) ((code) & 0x07)
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#define BPF_LD 0x00
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#define BPF_LDX 0x01
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#define BPF_ST 0x02
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#define BPF_STX 0x03
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#define BPF_ALU 0x04
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#define BPF_JMP 0x05
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#define BPF_RET 0x06
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#define BPF_MISC 0x07
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/* ld/ldx fields */
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#define BPF_SIZE(code) ((code) & 0x18)
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#define BPF_W 0x00
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#define BPF_H 0x08
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#define BPF_B 0x10
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#define BPF_MODE(code) ((code) & 0xe0)
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#define BPF_IMM 0x00
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#define BPF_ABS 0x20
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#define BPF_IND 0x40
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#define BPF_MEM 0x60
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#define BPF_LEN 0x80
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#define BPF_MSH 0xa0
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/* alu/jmp fields */
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#define BPF_OP(code) ((code) & 0xf0)
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#define BPF_ADD 0x00
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#define BPF_SUB 0x10
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#define BPF_MUL 0x20
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#define BPF_DIV 0x30
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#define BPF_OR 0x40
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#define BPF_AND 0x50
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#define BPF_LSH 0x60
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#define BPF_RSH 0x70
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#define BPF_NEG 0x80
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#define BPF_JA 0x00
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#define BPF_JEQ 0x10
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#define BPF_JGT 0x20
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#define BPF_JGE 0x30
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#define BPF_JSET 0x40
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#define BPF_SRC(code) ((code) & 0x08)
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#define BPF_K 0x00
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#define BPF_X 0x08
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/* ret - BPF_K and BPF_X also apply */
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#define BPF_RVAL(code) ((code) & 0x18)
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#define BPF_A 0x10
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/* misc */
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#define BPF_MISCOP(code) ((code) & 0xf8)
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#define BPF_TAX 0x00
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#define BPF_TXA 0x80
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/*
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* The instruction data structure.
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*/
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struct bpf_insn {
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u_short code;
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u_char jt;
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u_char jf;
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bpf_u_int32 k;
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};
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/*
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* Macros for insn array initializers.
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*/
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#define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
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#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
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/*
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* Structure to retrieve available DLTs for the interface.
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*/
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struct bpf_dltlist {
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u_int bfl_len; /* number of bfd_list array */
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u_int *bfl_list; /* array of DLTs */
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};
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#ifdef _KERNEL
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struct bpf_if;
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int bpf_validate(const struct bpf_insn *, int);
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void bpf_tap(struct bpf_if *, u_char *, u_int);
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void bpf_mtap(struct bpf_if *, struct mbuf *);
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void bpfattach(struct ifnet *, u_int, u_int);
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void bpfattach2(struct ifnet *, u_int, u_int, struct bpf_if **);
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void bpfdetach(struct ifnet *);
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void bpfilterattach(int);
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u_int bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int);
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#define BPF_TAP(_ifp,_pkt,_pktlen) do { \
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if ((_ifp)->if_bpf) \
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bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen)); \
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} while (0)
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#define BPF_MTAP(_ifp,_m) do { \
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M_ASSERTVALID(_m); \
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if ((_ifp)->if_bpf) \
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bpf_mtap((_ifp)->if_bpf, (_m)); \
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} while (0)
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#endif
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/*
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* Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
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*/
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#define BPF_MEMWORDS 16
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#endif /* _NET_BPF_H_ */
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